Optical disk apparatus and optical disk processing method

Abstract

An optical disk apparatus has a first optical system having an objective lens with a first NA, a second optical system having an objective lens with a second NA lower than the first NA. The optical disk apparatus at the time of processing the optical disk, when the optical system suitable recording/reproduction process of the optical disk is the second optical system, via the first optical system detecting a surface run-out of the optical disk and execute the focus lead-in process of the second optical system on the basis of a surface run-out detected; and when at the time of processing the optical disk, when the optical system suitable recording/reproduction process of the optical disk is the first optical system, processing the optical disk with the first optical system without detecting the surface run-out of the optical disk.

What is claimed is:  
     
       1. An optical disk apparatus comprising: 
       a drive motor for rotating an optical disk;  
       rotation angle detection means for detecting a rotation angle of said drive motor;  
       a first objective lens;  
       a first objective lens holder which holds said first objective lens and is supported to be drivable in an optical axis direction of said first objective lens and in one direction perpendicular to the optical axis;  
       a first focusing actuator for driving said first objective lens holder in the optical axis direction;  
       first focus detection means for detecting a relative deviation between said first objective lens and an information recording surface of the optical disk in the optical axis direction, and adjusting a focus to the information recording surface;  
       first drive control means for controlling driving of said first focusing actuator on the basis of a detection result of said first focus detection means;  
       storage means for storing a drive control signal output from said first drive control means and a rotation angle detection signal detected by said rotation angle detection means in synchronism with each other as surface run-out of the optical disk;  
       a second objective lens having a focal length shorter than said first objective lens;  
       a second objective lens holder which holds said second objective lens and is supported to be drivable in an optical axis direction of said second objective lens and in one direction perpendicular to the optical axis;  
       a second focusing actuator for driving said second objective lens holder in the optical axis direction;  
       second focus detection means for detecting a relative deviation between said second objective lens and the information recording surface of the optical disk in the optical axis direction, and adjusting a focus to the information recording surface;  
       second drive control means for controlling driving of said second focusing actuator on the basis of a detection result of said second focus detection means; and  
       optical disk process means for (i)executing a focus lead-in process by irradiating the rotating optical disk with a light beam applied via said first objective lens of a first optical system, said first objective lens having a first numerical aperture lower than a second numerical aperture of said second objective lens of a second optical system, while said second objective lens of the second optical system is retracted not less than a predetermined distance away from the optical disk, (ii)discriminating an optical system suitable for a recording/reproduction process of the optical disk, (iii)processing the optical disk, when the optical system suitable for the recording/reproduction process of the optical disk is the first optical system, by irradiating the optical disk with the light beam via said first objective lens of the first optical system without detecting a surface run-out of the optical disk from the reflected light of the light beam, (iv) and irradiating the optical disk with the light beam via said first objective lens of the first optical system, when the optical system suitable for the recording/reproduction process of the optical disk is the second optical system, detecting surface run-out of the optical disk, executing the focus lead-in process by irradiating the optical disk with the light beam via said second objective lens of the second optical system on the basis of a surface run-out learning result of the optical disk, and processing the optical disk by irradiating the optical disk with the light beam via said second objective lens of the second optical system.  
     
     
       2. An optical disk processing method comprising: 
       the first step of executing a focus lead-in process by irradiating a rotating predetermined optical disk with a light beam applied via a first objective lens of a first optical system, said first objective lens having a first numerical aperture lower than a second numerical aperture of a second objective lens of a second optical system;  
       the second step of discriminating an optical system suitable for a recording/reproduction process of the optical disk;  
       the third step of processing the optical disk, when the optical system suitable for the recording/reproduction process of the optical disk is the first optical system, by irradiating the optical disk with the light beam via the first objective lens of the first optical system without detecting a surface run-out of the optical disk from the reflected light of the light beam; and  
       the fourth step of processing the optical disk, when the optical system suitable for the recording/reproduction process of the optical disk is the second optical system, by irradiating the optical disk with the light beam via the second objective lens of the second optical system,  
       wherein the first step includes the fifth step of executing the focus lead-in process by irradiating the optical disk with the light beam via the first objective lens of the first optical system while the second objective lens of the second optical system is retracted not less than a predetermined distance away from the optical disk,  
       wherein the fourth step includes the sixth step of irradiating the optical disk with the light beam via the first objective lens of the first optical system, and detecting surface run-out of the optical disk from the reflected light of the light beam, the seventh step of executing the focus lead-in process by irradiating the optical disk with the light beam via the second objective lens of the second optical system on the basis of a surface run-out learning result of the optical disk detected in the sixth step; and the eighth step of executing the recording/reproduction process on the optical disk by irradiating the optical disk with the light beam via the second objective lens of the second optical system.